Typewriting machine



J. H. BARR.

TYPEWRIHNG MACHINE.

APPLICATION men mumsx I921.

1,418,901 PatentedJune 6, 1922..

WITNESSES 4g gs/ HIE ATTIIIRNEY PATENT OFFICE.

JOHN if. BARR, or NEW YORK, N. 'Y., ASSIGNOR T0 REMINGTON TYiEWRITER PANY, OF ILION, NEW YORK, CORPORATION OF. NEW YORK.

TYPEWRITING MACHINE.

To all whom it may concern Be it known that I, JOHN H. BARR, citizen of the United States, and resident of the borough of llfanhattan, city of New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Typewriting Mae chines, of which the following is a specification.

My present invention relates to line spacing mechanismfor typewritingmachines and its principal object-is to provide new and improved mechanism ofv the character specifie To the above and other ends which will hereinafter appear, my present invention consists in the features of construction, combinations of devices and arrangements of parts to be hereinafter described and particularly pointed out in the claims.

in the accompanying drawings which illustrate the preferred form of my invention,

Figure 1 is fragmentary vertical sectional view taken transversely of the platen carriage near its right-hand end and outside the platen, the platen ratchet wheel being indicated by dotted lines.

Figure 2 is a fragmentary vertical sectional view corresponding to Fig. 1 but omitting some of the parts shown in said Fig. 1 and showing other parts in different rela tionships. v v i Figure 8 is a vertical sectional view taken onplanes indicated by the broken dotted line l--1 in Fig. 1 and looking in the direction of the arrow at said line.

Figure 41 is a top plan view showing the devices for varying the extent of line spacingmovement. I

Figure 5 is a vertical sectional view taken on planes indicated by the dotted line 22 in Fig. 4: and looking in the direction of the arrow at said line. a section of the end bar of the platen carrier also being shown.

Figure 6 is a side elevation of the parts shown in Fig. 5 looked at from the lefthnnd side.

Figure 7 is a vertical sectional view taken on the plane indicated by the dotted line 3-4) in Fig. 1 and looking in the direction of the arrow at said line.

Specification of Letters Patent.

Application filed January 26, 1921.

centrally through the axle portions.

Serial No. 440,035.

Figure 8 is a fragmentary top, plan View showing the right-hand end portion of the platen and platen carrier with theline spacingmechanlsm associated therewith.

--As appears from Figs. 1, 8 and 8, the

traveling platen carrier or carriage consists -A front strike rotatable cylindrical platen 3 is provided with hearing or axle portions 4:, the right-hand axle a being shown with its associate twirler orknobfi. The platen axle bears on the endbars, the rotatable axis of the platen extending longitudinally of the platen frame or carrier and passing platen frame or carrier and platen are mounted to travel from side to side over the stationary frame of the machine, said carrier being mounted on roller; bearings 6 which co-operate with suitable stationary guideways. Connected with the right-hand end 'ofthe platen 3 in any suitable, manner, as for example by that employed in the No 10 Remingtontypewriting machine, is a line spacing wheel 7 which preferably is provided with ratchet teeth 8.

In order to'hold'the platen and prevent it from turning between line spacing oper ations' detent devices are provided, as shown in Figs. 1 and 3, comprising a roller detent '9 which is'adapted to cO-operatewith the ratchet teeth 8 at the under side of the line spacing ratchet wheel 7. Theroller detent 9 is arranged within the forked rear end portion of'an arm 10, said detent having a pivot pin '11 bearing inthe forked portions of said arm 10. Said arm extends forward and somewhat downward and at its front end is provided with a hub portion 12 which Patented June e, 1922 The bears rotatably on a rod 13 extending longi- I tudinally of the platen frame and supported .in the end bars thereof, a boss 2 projecting inward from the end bar 2, receiving the right-hand end portion of said rod 13. The hub 12 and the arm 10 are loosely confined between 'a cross pin 14 projecting from the rod 13 and the boss 2". Secured to the under side of the arm 10 by a screw 15 is a.

leaf spring 16, the free rear end portion of which is adapted to bear against the lower portion of the cross bar 1. The construction is such that the spring 16 acting through the arm 10 urges the roller detent 9 upward and maintains it yieldingly engaged with the ratchet teeth 8, said detent normally or between line spacing operations engaging with the line spacing wheel in the spacebetween two of the teeth 8 to hold the ratchet wheel and through it the platen against accidental turning movements.

Adapted to co-operate with the line spacing wheel 7 at its rear upper side is a a pawl member or actuator 17 which is provided with a pawl tooth l8 and with a tail portion or nose 19. ll hepawl or toothed device 17 is pivotally connected at its lower end by a headed pivot pin 20 with the rear end of an angularlyshaped guide arm orlink 2-1 which is arranged transversely of the platen and extends fore and aft of the machine, its forward end beingrecessed or countersunk to receive a headed shoulder screw 22 which bears in a threaded opening in a boss 2 projecting inward from the end bur and provides a pivotal support for the arm 2i. A spring friction washer 21" surrounds the reduced portion of the boss 2" and is confined between a shoulder on said boss and the arm 21. Said arm is adapted to vibrate up and down in a vertical fore and aft plane about the pivotal centeror shoulder screw 22, hearing during such pivotal movements on the head and shoulder portion of said screw. as will be understood from Fig. 3. This pivotal center 22 is eccentric of the platen axis. being forward of the platen axis and in substantially the same horizontal plane. The pawl 17 is arranged at the left of the arm 21 and in the plane of th ratchet wheel 7 with which it co-operates. Actuating movements are communicated to the pawl by a lever 23 which is arranged below the arm 21. and is-adapted to vibrate up and down in the same vertical fore and EliftDlillle as does said arm, and hence is on the same side of the line spacing wheel as is the arm 91. lever is of th third order, its rear end portion being slotted as indicated at let to cooperate with a pin projecting laterally from the pawl 1'? forward of its pivot. this pin and slot connection loosely connecting the lever 23 with the pawl l T. The forward end of the lever 23 is pivoted on a headed shoulder screw 26 which is threaded into the end bar 3. The fulcrum or pivot 26 of the lever 23 is forward of the Said.

to the axis of the platen and takes bearing in. a housing 31 which is preferably mace mtegii'al w1th the right-hand end bar 2 and 1s bored out to receive the rock shaft and its restoring spring which is coiled around a, reduced portion of the rock shaft within the housing. one end of said spring having aiiaed amhorage and the other end bcingconnccted to the rock shaft. Forward of the housing ill the rock shaft is provided with a flange 33 which with the crank arm 28 cooperates withthe housing or bearing 31*to prevent endwise displacement of the rock shaft. The forward or exposed. portion of therock shaft extends forward and downward, terminating in a line spacing finger piece or handl 3% which is conveniently dis- POFIQLl vith reference to the keyboard of the machine. The hand piece or handle el together with the downwardly curved portion of the rock shaft constitute in effect a crank arm which together with the crank arm 28 and the bearing portion or body of the rock shaft provide a bell crank having an elongated pivot. This portion of the line spacing mechanism. that is the rock shaft 30 and th parts directly connected there with comprising the two crank arms, is not novel. correspoiuling substantially with parts found in the No. '10 Remington machine. The line spacing handle is adapted to be swung rightward in .a substantially vertical plane parallel with the platen axis. causing the shaft 30 to rock and the crank arm 28 to be swung downward to actuate the pawl controlling mechanism in a manner hereinafter described.

F or varying the extent of line spacing movement devices are provided comprising. as will be understood from Flgs. 1, 3-6 and 8 an arm or carrier 35 vertically arranged inside the end bar 2 and provided at its lower end with a laterally extending bearing pin which bears in an opening indicated at 37 in said end bar. the arm being thus pivotally supported at its lower end. Near its upper end the arm carries a lcftwardly projecting stop pin or abutment 39 which serves as an arresting device or stop for the guide arm 21. The upper end portion of the arm 35 is formed with a cross head comprising a horizontal part 35 extending rightward over the top of the end bar and terminating 111 a downwardly projecting portion 35*.

The cross head portion has mounted on it a spring pressed detent pin 39 of ordinary construction provided with a knurled button or finger piece 40 by which the detent pin may be raised against its spring 39. The cross head loosely embraces a plate 41 which is arranged on the top of the end bar 2 at its rear, the rear portion of said plate being provided with holes indicated at 42 which receive securing screws 43 that are threaded into the said end bar. The plate 41 curves upward and forwardand is provided with a plurality of perforations or holes indicated at 44, there being three of such perforations in the present instance, the detent pin 39 beingadapted for co-operation with these perforations to hold the pivoted stop carrier or arm 35 and the stop 38 in any one of three predetermined positions. At its outside edge the plate 41 is'slotted or cut out as indicated at 45, providing end poitions or stops 46. The downward extension 35* of the cross head enters-the cut-out 45 and is adapted to co-operate with the end stops 46 to limit back and forward swinging movements of the stop device 35. It will be understood that by pulling up the detent pin 39 by means of its finger piece 40 the stop device 35 may be released and swung'on its pivot either forward or backward until the detent pin 39 is opposite the desired perforation 44, with which the detent pin may thereupon be caused to engage to locate the stop or abutment 38 in desired position. This abutment determines the normal position of the arm 21 and through it that of the pawl 17. The arm 21 ismaintained normally engaged with the abutment 38 by the action of the spring 32, the tension of which is transmitted to the arm .21 through the link 27 and the lever 23. In other words, the spring 32-is in efi'ect a restoring spring for the entire train of line spacing mechanism beginning with the handle 34 and terminating with the pawl. 17, and maintains these parts in the normal position illustrated in Fig. 1. From this figure it will be observed that the normal position of the arm 2] is determined by the stop 38 by which said arm .is arrested. The normal position of the lever 23 is determined in turn by the arm 21 with the under side of which the rear end portion of said lever contacts. The position of the pawl 14 normally is determined by the arm 21 amlthe' lever with which said pawl is connected atseparate' points, these points being solocate'd that normally the pawl tooth 18 is raised above and separated from the ratchet teeth 8 of the line spacing ratchet wheel. It will be understood that the normal position of the link 27 is in turn determined by the lever .23 with which the lower end of said link isconnected, the link in its'turn serving normally to posi; tion the rock shaft 30 and the parts fixed to line spacing operation.

it, including the handle 34. It will further be understood that the normal positions of the pawl 17 and the parts controlling it, including the arm 21 and lever 23, may be varied by varying the position of the stop or abutment 38 through manipulating the stop carrying arm 35, as has been described. In other words, when, as shown in the'drawing, the stop carrier 35 is located in its foremost position and set therein by the interlocking engagement of the detent pin 39 with the foremost perforation 44, the arm 21 and the pawl 17 will be maintained swung forward to their foremost position, giving the pawl its greatest extent of line spacing movement, this movement in the present instance'being suflicient to turn the ratchet wheel and platen through three units of line space dis tancef Similarly when the detent pin 39 is engaged with the middle perforation, the pawl is so located normally that its line spacingmovement is restricted to two units of line space distance, while when the detent pin is engaged with the rearmost perforation 44 a single unit of line space distance will be communicated to the platen at each Otherwise stated, the forward or illustrated location of the stop or abutment 38 positions the pawl for triple line spacing, the'middle'location positions it'for double line spacing, and the rearmost for single line spacing.

The end of the line spacing movement is determined by stop devices which, as illustrated in Figs. '1 and 2, comprise a leaf spring or stop linger 47 which is secured to the upper face of the platen frame bar 1 in the vertical plane of the pawl 17. The lower end of the leaf spring 47 receives a headed screw 48 which is threaded into the bar 1 and secures the spring 47 thereto' The upper free end portion of said spring rests against an adjustable abutment in theform of a screw 49 which is threaded through the bar 1 and is held in adjusted position by a check nut 50. By adjusting this screw 49 up or down the free end or stop portion of the leaf spring 47 is raised or lowered to vary the position of arrest of the pawl 17 and its operating mechanism. the tail portion 19 of said pawl contacting with the leaf spring as shown in Fig. 2 to arrest the parts at the end of the line spacing movement. A stop pin 51 projecting laterally from the pawl 17 is adapted to contact with the top of the arm 21 when the platen is removed from the platen carrier. said pin preventing undue displacement of the pawl.

In operation the line spacing handle 34 is swung rightward rocking the shaft 30 and swinging the crank arm 28 downward, this movement being transmitted through the link 27 to the lever 23 which in turn will be swung downward about its fulcrum 26. This movement of the lever is transmitted &

through the pin and slot connection 24, 25,

to the pawl member 157' which during the initial stage of movement will turn on its pivotal center 20 independently of the arm 21, which arm will remain motionless until the pawl tooth 18 engages with the ratchet wheel 7. Thereafter, as the movement of the pawl 17 and its controlling mechanism is continued, such movement will be trans mitted to the ratchet wheel 7 and the platen 3, which parts will be turned or rotated about the pivotal axis of the platen until the line spacing movement is ended, which occurs when the tail 19 of the pawl contacts with the stop i7. At the end of the line spacing movement as illustrated in Fig. 2, the pawl device 17 is so related to the line spacing ratchet wheel and the stop 47 that it is jammed into the ratchet wheel so as to prevent overthrow of the parts even when additional impetus results from the arrest of the carriage at the end of its return movement under the stroke or pull of the line spacing handle 34.

It will be observed that by my present invention there is provided a simple, eflicient and novel line spacing mechanism comprising comparatively few parts, easily constructed and assembled and readily accessible for adjustment or other purposes.

Various changes may be made without departing from my invention. M

that I claim is new and desire to secure by Letters Patent, is: i

1. In a type-writing machine, the combina tion of a platen carrier, a platen. a line spacing wheel connected to the platen, a rock shaft on said platen carrier, a lever connected thereto, an arm movable in the plane of said lever, and a pawl carried by said arm and directly connected with said lever, said pawl being operative by said lever to coact with said line spacing wheel.

2. In a typewriting machine, the combination of a platen carrier, a platen, a line spacing wheel connected thereto, a line spacing pawl, a lever connected to said pawl, a finger piece connected to said lever, a guide arm pivoted to swing inthe plane of said lever, said pawl being pivotally connected to said arm, said pawl being movable to some extent by said lever independently of said arm and prior to coacting with said line spacing wheel.

3. In a typewriting machine, the combination of a platen carrier, a rotatable platen thereon, a line spacing wheel connected to said platen, a lever mounted to vibrate in a vertical plane transverse of the platen axis, a finger piece connected to said lever, a guide arm pivotally mounted to vibrate inia vertical plane transverse of said platen axis, a line spacing pawl normally separated from said wheel and connected directly both to said lever andto said arm, said lever being operative to move said pawl independently of said arm into effective engagement with said line spacing wheel, said lever and said arm both thereafter moving with said pawl through the line spacing movement.

i. In a typewriting machine, the combination of a platen carrier, a platen, a line spacing wheel connected thereto, a line spacing pawl normally separated from said wheel, a guide arm pivoted eccentrically of said wheel and to which said pawl is pivotally connected, a lever having a direct loose connection with said pawl, and a finger piece connected tosaid lever, said lever being effective to move said pawl pivotally and in dependently of movement of said arm into engagement with said line spacing wheel,

said lever and said arm both thereafter moving with said pawl to the completion of the line spacing operation.

. 5. In a typewriting machine, the combination of a platen carrier, a platen, a line spacing wheel connected to the platen, a rock shaft on said platen carrier, a lever operative in a plane transverse of said platen, an arm operative in a plane transverse of said platen, a pawl pivotally connected with said arm, connections between said rock shaft and said lever, and direct pin and slot connections between said pawl and said lever, said pawl coacting with said line spacing wheel.

6. In a typewriting machine, the combination of a platen carrier, a platen, a line spacing wheel connected to the platen, a line spacing pawlyan arm pivoted at one end forward of the platen axle and connected at its opposite end in rear of the platen axle to said pawl, a lever fulcrumed at one end and connected at its opposite end to said pawl, a finger piece, and connections between said lever and said finger piece.

7. In a typewriting machine, the combination or" a platen carrier, a platen, a line spacing wheel connected to the platen, a rock shaft on said platen carrier, a line spacii'ig pawl, an arm pivoted at one end forward of the platen axle and connected at its opposite end in rear of the platen axle to said pawl, a lever fulcruined at one end and connected at its opposite end to said pawl, a link connected to said leverbetween its ends, and a crank arm fixed to saidrock shaft and connected to said link.

8. In a typewriting machine, the combination of a platen carrier, :1 platen, a line spacing wheel connected to the platen, a rock shaft on said platen carrier, a line spacingpawl, an arm pivoted at one end forward of the platen axle and connected at its opposite end in rear of the. platen axle to said pawl, a lever fulcrumed at one end and connected at its opposite end to said pawl, a link connected to said lever between its ends, a crank arm fixed to said rock shaft and connected to said link, and a line spacing arm or handle fixed to said rock shaft.

9. In a typewriting machine, the combination of a platen carrier, a platen-,a .line spacing wheel connected tothe platen, a line spacing handle on said platen carrier, a line spacing pawl. operative on said wheel, an arm or link pivoted at one end to said platen frame and at its opposite end having a pivotal connection with said pawl, a .lever pivoted at one end and having at its opposite end a pinand slot connection with said pawl, and connections between said lever and said handle.

10. In a typewriting machine, the combination of a platen carrier,'a platen, a line spacing wheel connected to the platen, a line spacing pawl co-operative with said wheel, a line spacing finger piece, and connections between said finger piece and said pawl comprising a lever and an arm arranged one above the other and vibratable in the same plane, both said lever. and said arm being directly connected to said pawl.

11. In a typewriting machine, the combination of a platen carrier, a platen, a line spacing-wheel connected to the platen, a line spacing pawl operative on said wheel, a finger piece, a lever, connections between saidfinger piece and said lever, a pivoted guide arm to which said pawl is connected,

and connections between said pawl andsaid lever, said lever and said guidearm being arranged at the same side of said line spacing wheel. i

12. In a typewriting machine, the. combination of a platen frame, a rotary platen mounted on said frame, a line spacing wheel connected to said platen, a line spacing pawl,

'a line spacing handle movable in-a plane parallel with the platen axis, a pivoted -arm movable in a vertical plane transverse of the platen axis to which said pawl is connected, a lever fulcrumed to vibrate in a vertical plane transverse of said platen axis and operative on said pawl, and connections between said handle and said lever, said lever and-said arm both extending fore-and-aft transversely of the line spacing wheel, and being arranged at the same side of said wheel.

13. In a typewriting machine, the combination of a platen frame, a rotary platen mounted on said frame, a line spacing, wheel connected to said platen, a line spacing pawl, a line spacing handle movable'in a plane parallel with the platen :axis, a pivoted arm movable in a plane transverse of the platen axis to which said pawl is connected, a leverfulcrumed to vibrate m a plane transverse of said platen axis and operat ve on said pawl, and connections between said handle and saidlever, said connections comprising a rock shaft mounted to turn on said platen frame at right angles to the axis-of the platen,said handle being fixed to said rock shaft, a crank arm fixed to said rock shaft,and a link connecting said crank arm and said lever, said. lever and said arm both extending fore-and-aft transversely of the line spacing wheel, and being arranged at the same side ofsaid wheel.

1.4:. In a typewriting machine, the combination of a platen frame, a platen rotatably mounted thereon, a line spacing wheelconnected to said platen, a line spacing actuator co-operative with said wheel. andmeans for. operating said actuator, said means comprisinga hand operated lever and a. pivoted guide arm, said lever being fulcrumed eccentrically of the platen axis, and said guide arm beingpivoted eccentrically of the platen axis, said lever and said guide armboth being vibratable transversely of wheel connected to said platen, a line spacingactuator co-operative with said wheel, and means for operating sald actuator, said means comprising a hand operated lever and a pivoted guide arm, both being vibratable up anddown, said lever having its fulcrum forward of the platen axis and substantially in the samehorizontal plane, and said guide arm being pivoted forward of said platen axis and substantially in the same horizontal plane, said pawl beingconnected directly both to said lever and to said guide arm.

16. In a typewriting machine, the combination of a platen frame, a cylindrical platen rotatably mounted thereon, a line spacing wheel connected to said platen, a line spacing pawl, a pivoted spring pressed guide arm operative in a vertical plane transverse of the platen'axis and to which said pawl is pivotally connected, at stop for arresting said arm in normal position, and

a hand operated lever of the third order vibratable in a vertical plane "transverseof the platen axis and having direct pin and slot: connection with said pawl.

' 17 In a typewriting machine, the combination of a platen frame, a cylindrical. platen rotatably mounted thereon, a line spacing wheelconnected tosaid platen, a llne spacing pawl, a pivot-ed spring pressed guide arm operative in a fore and aft plane transverse ofthe platen axis andto which saidpawlis pivotally connected, a stop for arresting said arm .in normal position, a

lever pivoted: at its forward end to vibrate in a plane transverse of the platen axis and havingat its rear end a direct pin and slot connection with said pawl, a line spacing handle, and operating connections between said handle and said lever comprising a device efiective on said lever between itsends.

18. In a typewriting machine, the combination of a platen frame, a cylindrical platen rotatably mounted thereon, a: line spacing wheel connected to said platen, a line spacing pawl, a guide arm operative in a fore and aft plane transverse of the platen axis and to which said pawl is pivotally connected, a stop for arresting said arm in normal position, a lever pivoted at its forward end to vibrate in a plane transverse of the platen axis and having at its rear: end a direct pin and slot connection with said pawl, a link connected to said lever between its ends, a crank arm to which said link is connected, a rock shaft to which said crank arm is fixed, a line spacing handle at the forward end of said rock shaft, said handle being movable in a plane parallel with the platen axis, and spring means for restoring said rock shaft, lever and guide 19. In a typewriting machine, the combination of a rotatable platen, a line spacing ratchet wheel connected thereto, a line spacing pawl, a guide arm pivotally supporting said pawl and itself pivoted eccentrically of the platen, a pawl operating lever engaged directly with said pawl below the guide arm and vibratable in the same plane, a stop for determining the normal position of the guide arm, said guide arm serving as a stop to determine the normal position of said lever, and spring means constantly tending to maintain said guide arm in contact with said stop and to maintain said lever in contact with said guide arm.

20. In a typewriting machine, the comb-ination of a platen frame, a cylindrical platen rotatably mounted on said frame, a line spacing ratchet wheel connected to said platen, a line spacing pawl co-operating with said ratchet wheel, a guide arm pivoted atone end eccentrically of the platen and having at its other end a pivotal connection with said pawl, a stop, a pawl operating lever arranged below said guide arm and vibratable in the same plane, said lever having a pin and slot connection with said pawl,

hand actuated means" for operating said lever, and a spring eflective on said lever to maintain it normally in contact with said guide arm, and said guide arm against said stop, said guide arm serving as a stop to determine the normal position of said lever.

21. In a typewriting machine, the combination of a platen frame, a front strike platen rotatably mounted thereon, a line spacing ratchet wheel connected to the platen, a line spacing pawl arranged behind said line spacing wheel, a fore aft ac tuating lever loosely connected to said pawl,

. a fore and aft guide arm pivoted eccentrically of said platen and to which said pawl is pivot'ally connected, a restoring spring operative on said guide arm, a stop for determining the normal position of said pawl, hand operated lever for actuating said pawl, a roller detent co-operative with the ratchet wheel at its under side, a rod extending lengthwise of the platen and mounted on said platen frame, an arm pivoted on said rod and on which said roller dotcnt is supported, and a spring effective on said pivoted arm.

22. In a t'ypewriting machine, the combination of a platen frame, a cylindrical platen rotatably mounted thereon, a line spacing wheel connected to said platen. a line spacing pawl, a pivoted spring pressed guide arm operative in a fore and aft plane transverse of the platen axis and to which said pawl is pivotally connected, a stop for arresting said arm in normal position, a hand operated lever directly connected to said pawl, and a second stop fixed on said platen frame with which the tail of said pawl cooperates to arrest the parts at the end of the line spacing movement, I i

23. In a typewriting machine, the combi nation of a platen frame, a cylindrical platen rotatably mounted thereon, a line spacing wheel connected to said platen, a line spacing pawl, a pivoted spring pressed guide arm operative in a fore and aft plane trans verse of the platen axis and to which said pawl is pivotal-ly connected, a stop for an resting said arm in normal position, a hand operated lever connected to said pawl, and stop devices for determining the line spa-c ing movement, said stop devices comprising a leaf spring secnred at one end to said platen frame and an adjustable abutment cooperating with the free end of said leaf spring to vary its arresting position, said pawl coacting with the free end of said leaf. spring. 1 i

24-. In a typewriting machine, the combination of a platen frame, a platen rotatable thereon, a line spacing ratchet wheel conneeted to the/platen, a line spacing pawl, mechanism for actuating said pawl, and stop devices for determining the normal position of said mechanism, said stop devices com- 1 5 prising a pivoted arm, a stop proper proleeting laterally from said arm, a spring detent pin carried by said arm, and a plate provided with perforations and embraced by a bent portion of said arm.

25. In a typewriting machine. the combination of a platen frame comprising an end bar, a rotatable platen, a line spacing ratchetwheel connected to the platen, a line spacing pawl, mechanism for actuating said pawl, and stop devices for determining the normal position of said mechanism, said stop device's comprising a vertically arranged arm bent at its upper end portion to provide a cross head, the 1ower end of said am being provided. with a pin pivotally engaging in. an opening in said end bar, a stop lug proper projecting from said arm oppositely from said pin, a spring pressed detent pin mounted on said cross head, and a plate detachably secured to the top of said end bar and provided with a plurality of perforations with which said detent pin may co-operate. 26. In a typewriting machine, the combination of a platen frame comprising an end bar, a rotatable platen, a line spacing ratchet wheel connected to the platen, a line spacing,- pawl, mechanism for actuating said pawl, and stop devices for determining the normal position of said mechanism, said stop devices comprising a vertically arranged arm bent at its upper end portion to provide a cross head, the lower end of said arm being provided with a pin pivotally engaging in an opening in said end bar, a stop lug proper projecting from said arm oppositely from said pin, a spring pressed detent pin mounted on said cross head, and a platen detachably secured to the top of said end bar and provided with a plurality of perforations with which said detent pin may co-operate, said plate being embraced by said cross head, said .cross head comprising a downwardly projecting portion co-operating with a slot in said plate to limit pivotal movements of said arm.

Signed at the borough of Manhattan, city of New York, in the county of New York and State of New York this 25th day of January, A. D. 1921.

JOHN H. BARR.

Witnesses:

LILLIAN NELSON, E. M. WELLS. V 

